The problem is that you've changed the com_hunkmegs but the changes haven't been applied yet. I suppose restarting the game should work, but sometimes it loads the default value of 56 so instead you should add +set com_hunkmegs 128 as a parameter when you start ET.

To do that create a shortcut to ET.exe and right click the shortcut and open properties. In the target field you should have something like